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Old 12-18-2008, 05:04 PM
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Default Barnacles on an Aluminum hull..How to remove ?

I am advised my buddies 19.5 Aluminum Lund Tyee that I am likely to buy (see other post) was left to sit in the salt a summer and has some pretty serious barnacle growth. It has been out on a trailer for several months now. They are dead but there. No bottom paint on the boat.
What is the best removal /cleaning process ?
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Old 12-18-2008, 06:29 PM
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Default Re: Barnacles on an Aluminum hull..How to remove ?

I had a similar problem . . . scraped as much as I could and then had it 'soft blasted' with some sort of shells The big problem however may not be the barnacles but rather that you may have severe pitting under many of the removed barnacles if which may have resulted from stray electricity in the water interacting with the barnacles Good luck in solving your problem
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Old 12-18-2008, 09:30 PM
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Default RE: Barnacles on an Aluminum hull..How to remove ?

Getting the shells off is fairly easy with a scraper. The adhesive ring that remains is very tough and virtually requires acid to remove it. That works of fiberglass but is going to dissolve the aluminum faster than the barnacle. The glue from barnacles is said to be the inspiration for crazy glue.
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Old 12-18-2008, 10:57 PM
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Default RE: Barnacles on an Aluminum hull..How to remove ?

Freaks me out a bit. Aluminum is supposed to be the industrictible boating material other than galvanic corrosion. Solved with zinc sacrificial anodes. Is a glass bead blast and bottom paint the awnser ? Then again, I hear/read here bottom paint and aluminum are not a heavenly match.
I just want to get rid of the buggers on the hull safely and economically. They (barnacles) are ubiquitous
The aluminum boat guys must know or are not confessing. Come on . THT.
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Old 12-18-2008, 11:27 PM
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Default Re: Barnacles on an Aluminum hull..How to remove ?

Scrape'em off. No need to get picky with the rings. Only copper free bottom paints like Interlux Trilux can be used on aluminum under water. Metal and saltwater don't mix especially aluminum so you have to use whats made for it. Capt.Matt
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Old 12-19-2008, 01:58 AM
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Default Re: Barnacles on an Aluminum hull..How to remove ?

I have done a 25ft boat 2 or 3 times now over the past few years. Get one of those wire brush heads for your angle grinder, scrape first and then and hit them with the wire. Then tidy up anything left with an orbital sander and some not too coarse sandpaper. Hull will look like new when you finish, just remember you will need gloves, overalls, mask and goggles.
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Old 12-19-2008, 09:08 AM
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Default Re: Barnacles on an Aluminum hull..How to remove ?

The secret is a very sharp scraper. Keep a file handy and constantly sharpen the blade. Use a good two handed scraper, not a wussy thing you use on a screen door frame. Obviously if you can turn the boat upside down, you'll be able to do a better job.
On aluminum use ONLY aluminum oxide or stainless steel.
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Old 12-19-2008, 12:33 PM
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Default Re: Barnacles on an Aluminum hull..How to remove ?

Thanks Guys. Off to work it is.
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Old 12-19-2008, 12:39 PM
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Default RE: Barnacles on an Aluminum hull..How to remove ?

Quote:
stapon251 - 12/19/2008 12:57 AM . They (barnacles) are ubiquitous The aluminum boat guys must know or are not confessing. Come on . THT.
PS I own a 34 ft aluminum welded boat and I ran into a serious barnacle problem

I strongly suggest you not use any acids

I strongly suggest you not use any copper tools . . . only stainless or aluminum

I had my boat blasted with what I believe were walnut shells after the worst was scraped off

What I said in my post above worked on my aluminum hull . . . ask the coast guard as they have lots of aluminum hulls . . . but you need two coats of primer and you have to use bottom paint especially formulated for aluminum . . . there is also a minimum and maximum time between each coat of primer and bottom paint

I strongly suggest you not use bottom paint intended for a fiberglass boat on an aluminum boat

Interluxwebsite has lots of info on bottom painting aluminum hull . . . they make a great product

Again, you may have serious pitting under the barnacles as described in my post above . . . don't be surprised . . . there are a number of fillers you can use to fix the pits, but you have to blast them clean, a wire brush may not work

Good luck
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Since there is no longer a Miss Cécile in my life,
I think I might rename my Bertram “Miss-Be-Haven too”
And get myself some new t-shirts.
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Old 12-19-2008, 12:40 PM
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Default Re: Barnacles on an Aluminum hull..How to remove ?

Also, do not sand blast as it will really tear away at the aluminium . . . you need a softer process
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Since there is no longer a Miss Cécile in my life,
I think I might rename my Bertram “Miss-Be-Haven too”
And get myself some new t-shirts.
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Old 12-19-2008, 12:42 PM
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Default Re: Barnacles on an Aluminum hull..How to remove ?

I have no experience with soda blasting an aluminium boat

I saw the coasties use walnut shells so I used the same product and process

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Since there is no longer a Miss Cécile in my life,
I think I might rename my Bertram “Miss-Be-Haven too”
And get myself some new t-shirts.
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Old 12-19-2008, 03:20 PM
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Default Re: Barnacles on an Aluminum hull..How to remove ?

I don't think he's going to paint it, just get the barnies off.
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Old 12-19-2008, 04:52 PM
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Default Re: Barnacles on an Aluminum hull..How to remove ?

You need scrape and sand, most wire brushes are steel and will induce further corrosion, welding supply stores will sell a stainless steel cupped brush but scraping and a light sanding will be the easiest.
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